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Consolidated Statements of Stockholder's Equity Consolidated Statements of Stockholder's Equity - USD ($) shares in Thousands, $ in Millions | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2022 |  | 16,762 |  |  |
Beginning balance at Dec. 31, 2022 | $ 572.1 | $ 0.0 | $ 28.5 | $ 576.8 | $ (33.3)
Net income | 23.8 |  |  | 23.8 |
Stock-based compensation expense | 2.2 |  | 2.2 |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture |  | 242 |  |  |
Issuance of shares under stock plans, net | (4.2) |  | (4.2) |  |
Pension and other postretirement employee benefit plans, net of tax | (0.1) |  |  |  | (0.1)
Stock Repurchased and Retired During Period, Shares |  | (51) |  |  |
Stock Repurchased and Retired During Period, Value | (1.7) |  | (1.7) |  |
Ending balance (in shares) at Mar. 31, 2023 |  | 16,953 |  |  |
Ending balance at Mar. 31, 2023 | 592.0 | $ 0.0 | 24.7 | 600.6 | (33.4)
Beginning balance (in shares) at Dec. 31, 2022 |  | 16,762 |  |  |
Beginning balance at Dec. 31, 2022 | 572.1 | $ 0.0 | 28.5 | 576.8 | (33.3)
Net income | 53.5 |  |  |  |
Ending balance (in shares) at Jun. 30, 2023 |  | 16,708 |  |  |
Ending balance at Jun. 30, 2023 | 614.5 | $ 0.0 | 17.7 | 630.3 | (33.4)
Beginning balance (in shares) at Mar. 31, 2023 |  | 16,953 |  |  |
Beginning balance at Mar. 31, 2023 | 592.0 | $ 0.0 | 24.7 | 600.6 | (33.4)
Net income | 29.7 |  |  | 29.7 |
Stock-based compensation expense | 1.7 |  | 1.7 |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture |  | 18 |  |  |
Issuance of shares under stock plans, net | (0.4) |  | (0.4) |  |
Pension and other postretirement employee benefit plans, net of tax | $ (0.1) |  |  |  | (0.1)
Stock Repurchased and Retired During Period, Shares | (263) |  |  |  |
Stock Repurchased and Retired During Period, Value | $ (8.4) |  | (8.4) |  |
Ending balance (in shares) at Jun. 30, 2023 |  | 16,708 |  |  |
Ending balance at Jun. 30, 2023 | 614.5 | $ 0.0 | 17.7 | 630.3 | (33.4)
Beginning balance (in shares) at Dec. 31, 2023 |  | 16,485 |  |  |
Beginning balance at Dec. 31, 2023 | 668.8 | $ 0.0 | 14.9 | 684.5 | (30.7)
Net income | 17.2 |  |  | 17.2 |
Stock-based compensation expense | 2.2 |  | 2.2 |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture |  | 175 |  |  |
Issuance of shares under stock plans, net | (3.1) |  | (3.1) |  |
Stock Repurchased and Retired During Period, Shares |  | (13) |  |  |
Stock Repurchased and Retired During Period, Value | (0.5) |  | (0.5) |  |
Ending balance (in shares) at Mar. 31, 2024 |  | 16,647 |  |  |
Ending balance at Mar. 31, 2024 | 684.5 | $ 0.0 | 13.5 | 701.7 | (30.7)
Beginning balance (in shares) at Dec. 31, 2023 |  | 16,485 |  |  |
Beginning balance at Dec. 31, 2023 | 668.8 | $ 0.0 | 14.9 | 684.5 | (30.7)
Net income | (8.6) |  |  |  |
Ending balance (in shares) at Jun. 30, 2024 |  | 16,642 |  |  |
Ending balance at Jun. 30, 2024 | 658.6 | $ 0.0 | 13.5 | 675.8 | (30.7)
Beginning balance (in shares) at Mar. 31, 2024 |  | 16,647 |  |  |
Beginning balance at Mar. 31, 2024 | 684.5 | $ 0.0 | 13.5 | 701.7 | (30.7)
Net income | (25.8) |  |  | (25.8) |
Stock-based compensation expense | 2.8 |  | 2.8 |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture |  | 59 |  |  |
Issuance of shares under stock plans, net | 0.2 |  | 0.2 |  |
Stock Repurchased and Retired During Period, Shares |  | (64) |  |  |
Stock Repurchased and Retired During Period, Value | (3.0) |  | (3.0) |  |
Ending balance (in shares) at Jun. 30, 2024 |  | 16,642 |  |  |
Ending balance at Jun. 30, 2024 | $ 658.6 | $ 0.0 | $ 13.5 | $ 675.8 | $ (30.7)

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